jsp+servlet搭建在線投票問卷系統

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開發環境準備：

1. jdk1.8
2. tomcat8
3. mysql5.7
4. intellij IDEA

系統採用技術：

1. jsp+ servlet mvc三層架構模式
2. jdbc
3. jQuery+ajax
4. ECharts 4.3.0

項目介紹

用戶端

1. 用戶端能夠查看問卷列表並參與問卷調查

2. 查看我的參與的調查報告以及整個問卷狀況

管理端

1. 問卷的新增和維護

2. 用戶信息維護

項目設計

運行效果

• 登陸

• 添加問卷

• 問卷投票列表

• 投票詳情

• 數據庫表

• 代碼結構

關鍵代碼:

1.添加問卷：

public void doGet(HttpServletRequest request, HttpServletResponse response) throws  IOException {
        String questionTitle = request.getParameter("questionTitle"); //問卷標題
        String qId = request.getParameter("qId"); //問卷id
        Integer ops =Integer.valueOf(request.getParameter("ops"));//具體幾組
        String doType=request.getParameter("doType"); //操做類型

        User user=(User)request.getSession().getAttribute(User.SESSIONNAME);
        SubjectService subjectService=new SubjectServiceImpl();
        List<Subject> subjects=new ArrayList<>(); //問題列表
        Question question=new Question();
        question.setTitle(questionTitle);
        if("add".equalsIgnoreCase(doType)){ //若是修改添加id
            if(null!=user){//用戶對象不爲空，保存值
                question.setUserId(user.getId());
            }
        }else{
            question.setId(Integer.valueOf(qId));
        }
        String title="";
        for(int i=0;i<ops;i++){
            int number = Integer.parseInt(request.getParameter("number"+i));
            String[] os = request.getParameterValues("options"+i);
            String[] osIds = request.getParameterValues("optionsIds"+i);//選項id
            title=request.getParameter("title"+i);//問題標題
            String titleId=request.getParameter("titleId"+i);//問題id

            Subject subject = new Subject();
            subject.setOrderId(i);
            subject.setTitle(title);
            subject.setNumber(number);
            if(null!=titleId&&!"".equalsIgnoreCase(titleId)){//設置問題id
                subject.setId(Integer.valueOf(titleId));
            }
            for(int i1=0;i1<os.length;i1++){
                Option op = new Option();
                op.setContent(os[i1]);
                if("modify".equalsIgnoreCase(doType)){ //若是修改添加id
                    op.setId(Integer.valueOf(osIds[i1]));
                }
                subject.getOptions().add(op);
            }
            try {
                long startTime=new Date().getTime();
                subject.setStartTime(startTime);
                subject.setEndTime(startTime+1*24*60*60*1000);
                subject.setMaster(user);
                subjects.add(subject);
            } catch (ReTryException e) {
                HttpSession session = request.getSession();
                session.setAttribute("subject", subject);
                session.setAttribute("message", e.getMessage());
                response.sendRedirect(request.getContextPath() + "/m/add");
            } catch (Exception ex) {
                throw new RuntimeException(ex);
            }
        }
        try{
            if("add".equalsIgnoreCase(doType)){//添加
                subjectService.add(question,subjects);
            }else{//修改
                subjectService.modify(question,subjects);
            }
        }catch (Exception e){
            e.printStackTrace();
        }

        if(null!=user&&user.getRole().equalsIgnoreCase("user")){
            response.sendRedirect(request.getContextPath() + "/list?action=myRelease");//用戶查看本身的發佈
        }else{
            response.sendRedirect(request.getContextPath() + "/list?action=index");
        }

    }

2.修改問卷信息

public void doGet(HttpServletRequest request, HttpServletResponse response) {
        int id = Integer.parseInt(request.getParameter("id"));
        try {
            SubjectService subjectService = new SubjectServiceImpl();
            QuestionService questionService = new QuestionServiceImpl();
            SubjectQueryModel subjectQueryModel=new SubjectQueryModel();
            subjectQueryModel.setQuestionId(id);
            List<Subject> subject = subjectService.getSubjects(subjectQueryModel);//問題列表
            subjectQueryModel.setQuestionId(id);
            Question question=questionService.getQuestion(id);
            request.setAttribute("subjects", subject);
            request.setAttribute("ops", subject.size());//多少組
            request.setAttribute("question", question);
            request.getRequestDispatcher("/WEB-INF/pages/modify.jsp")
                   .forward(request, response);
        } catch (Exception e) {         
            throw new RuntimeException(e);
        }
    }

3.問卷投票

public void doGet(HttpServletRequest request, HttpServletResponse response)  {
            try{
                PrintWriter printWriter = response.getWriter();
                int subjectId=Integer.parseInt(request.getParameter("subjectId"));
                String id = request.getParameter("options");
                String[] ids = id.split(",");
                if(null==ids){ //未選中任何一項答案
                    printWriter.println(0);
                    return;
                }else{
                    User user= (User)request.getSession().getAttribute(User.SESSIONNAME);
                    //若是登陸用戶，判斷是否已經投過票
                    if(null!=user){
                        RecordQueryModel recordQueryModel=new RecordQueryModel();
                        recordQueryModel.getUser().setId(user.getId());
                        recordQueryModel.getSubject().setId(subjectId);
                        List<Record> list=recordService.getVotes(recordQueryModel);
                        if(list.size()>0){          //當前用戶已經投過票
                            printWriter.println(2);
                            return;
                        }
                    }
                    List<Record> records = new ArrayList<>();
                    for(int i=0;i<ids.length;i++){
                        Record record = new Record();
                        record.getSubject().setId(subjectId);
                        record.getOption().setId(Integer.parseInt(ids[i]));
                        if(null!=user){
                            record.getUser().setId(user.getId());
                        }
                        records.add(record);
                    }
                    try {
                        recordService.vote(records); //保存問卷信息
                        printWriter.println(1);//參與成功
                        return;
                    } catch (ReTryException e) {
                        e.printStackTrace();
                        printWriter.println(3);//參與成功
                        return;
                    }catch(Exception ex){
                        ex.printStackTrace();
                        throw new RuntimeException(ex);
                    }
                }
            }   catch (Exception e){
                e.printStackTrace();
            }
        }

根據jdbc直連技術，編寫數據庫操做工具類，方便存儲數據，代碼以下：

public class DBUtils {
    String url = null;      //鏈接地址
    String username = null;     //數據庫名
    String password = null;     //數據庫密碼
    String driverClass = null;  //鏈接驅動
    private static DBUtils db = new DBUtils();
    /**構建數據庫鏈接參數*/
    private DBUtils() {
        try {
            url = "jdbc:mysql://localhost:3306/shopCartDb?useUnicode=true&characterEncoding=utf8";
            username = "root";
            password = "root123";
            driverClass = "com.mysql.jdbc.Driver";
            Class.forName(driverClass);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    /**構建數據庫鏈接對象*/
    public Connection getConnection(){
        Connection conn = null;
        try {
            conn = DriverManager.getConnection(url, username, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }
    public static DBUtils getInstance(){
        return db;
    }
}

4.投票可視化代碼

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        HttpSession session = request.getSession();
        try {
            int subjectId=Integer.parseInt(request.getParameter("subjectId")); //題目
            RecordService recordService=new RecordServiceImpl();
             List<Record> list=recordService.geyVotes(subjectId);
             if(list.size()>0){
                 session.setAttribute("list", list);
                 session.setAttribute("stitle", list.get(0).getSubject().getTitle());
                 List<String> opDatas=new ArrayList<>();
                 Map<String,Integer> map=new HashMap<>();
                 for(Record r:list){
                     if(null!=r.getOption()){
                         if(!opDatas.contains(r.getOption().getContent())){
                             opDatas.add(r.getOption().getContent());
                             map.put(r.getOption().getContent(),0);
                         }
                         map.put(r.getOption().getContent(),map.get(r.getOption().getContent())+1);
                     }

                 }
                 String opData="";
                 for(String o:opDatas){
                     opData=opData+"'"+o+"',";
                 }
                 if(opData.length()>0){
                     opData=opData.substring(0,opData.length()-1);
                 }
                 session.setAttribute("opData", opData);    //選項
                 String datavn="";
                 for (String key : map.keySet()) {
                     datavn=datavn+"{ value: "+map.get(key)+", name: '"+key+"' },";
                 }
                 if(datavn.length()>0){
                     datavn=datavn.substring(0,datavn.length()-1);
                 }
                 session.setAttribute("datavn", datavn);
                 request.getRequestDispatcher("/WEB-INF/pages/view.jsp").forward(request, response);
                 return;
             }else{
                request.setAttribute("exception","暫無問卷結果！");
                 request.getRequestDispatcher("/WEB-INF/pages/500.jsp").forward(request, response);
                 return;
             }
        } catch (ReTryException e) {
            request.getSession().setAttribute("message", e.getMessage());
            response.sendRedirect(request.getContextPath()+"/m/view");
        }catch(Exception ex){
            ex.printStackTrace();
        }
    }

核心代碼截圖

• 個人發佈後臺程序

• 管理員維護界面後臺代碼

• 管理員建立界面後臺代碼

時序圖

• mvc流程圖

• 問卷操做時序圖

• 用戶註冊登陸時序圖